Subjects: Biology >> Botany >> Applied botany submitted time 2023-12-24 Cooperative journals: 《广西植物》
Abstract： Camellia sinensis var. sinensis cv. ‘Liupao’ is the main raw material for making Liupao tea. To explore the genetic background of C. sinensis var. sinensis cv. ‘Liupao’, especially its phylogenetic position and evolutionary history, 27 and five individuals of C. sinensis var. sinensis cv. ‘Liupao’ and C. costata were sampled for genome skimming and transcriptomic sequencing. The phylogenetic relationship between C. sinensis var. sinensis cv. ‘Liupao’ and other Camellia was reconstructed, the divergence time of the chloroplast genome sequences of C. sinensis var. sinensis cv. ‘Liupao’ was estimated, and the genetic diversity was investigated. The results were as follows: (1) On the chloroplast tree, 27 samples of C. sinensis var. sinensis cv. ‘Liupao’ were divided into two distantly-related groups, one was nested within a clade mainly consisting of C. sinensis, being interspersed among other cultivated C. sinensis, while the other group formed as a well supported lineage that was most closely-related to and nested within C. costata; On the nuclear gene tree, however, all the 27 samples formed a clade with other C. sinensis as well as some other Camellia species with generally unresolved relationships among them. Despite the lack of resolution in this clade, it was definitely far separated from C. costata; The cytonuclear phylogenetic conflict suggested once ancient introgression hybridization of C. costata with the ancestor of some C. sinensis var. sinensis cv. ‘Liupao’ individuals so that the latter captured the chloroplast genome of the former. (2) The time estimate indicated that the introgression hybridization event occurred in the Quaternary period, ca. 1.55 million years ago, long before the history of tea cultivation and production by humans. (3) In addition, both the chloroplast genomes and nuclear genes revealed that the C. sinensis var. sinensis cv. ‘Liupao’ had high haplotype diversity, possessing high evolutionary potential. This study could provide important references for the germplasm protection, breeding, and utilization of high-quality C. sinensis var. sinensis cv. ‘Liupao’ strains.
Subjects: Biology >> Botany >> Applied botany submitted time 2023-12-24 Cooperative journals: 《广西植物》
Abstract： Primulina pingguoensis H.S. Ma & B. Pan, a new species of Gesneriaceae from Guangxi Zhuang Autonomous Region, China, is illustrated and described here. The new species morphologically resembles Primulina carinata Y.G. Wei, F. Wen & H.Z. Lü, but it differs from the latter by lobes narrowly lanceolate-linear，length-width ratio >2 (rounded-ovate，length-width ratio <1.5), 8–10 purple stripes from corolla throat to the bottom of corolla tube, without honey guides (vs. brown stripes, 2 yellow honey guides inside, leaf blade elliptic to broadly ovate, 6.5–9.5 × 4.5–6.5 cm (vs. broadly elliptic to ovate, 4.0–5.0 × 3.0–4.0 cm), leaf blade base slightly cuneate (vs. rounded), corolla tube tubular, ventrally carinate, (vs. narrowly funnelform, strongly carinate, forming a clear keel), etc. The conservation status of P. pingguoensis is considered as ‘Critically Endangered’ (CR) according to the IUCN red list categories and criteria.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-02-14 Cooperative journals: 《广西植物》
Abstract： Nutrient availability is a key factor determining the growth and competitive dominance of alien invasive plants. Variation for plastic response among introduced populations may provide the potential for invasive plants to evolve greater plasticity and promote their invasions. Understanding how nutrient availability affects the growth and competitive ability of invasive plants, as well as whether there is variation for plastic response among introduced populations will help to predict the invasion risk of alien plants. Bidens frondosa, which originated in North America, has been reported in most provinces in China in recent years. In order to explore the potential of B. frondosa to become invasive, we tested the growth and competitive response of B. frondosa by planting four introduced populations of B. frondosa alone and together with the native congener B. biternata under three nutrient levels. The results were as follows: (1) When grown alone under high nutrient, B. frondosa had significantly higher values for plant height, branch number and total biomass compared with those grown at low nutrient. The reproductive ratios of all the populations at low nutrient were significantly greater than that at high nutrient except for the population Jiangsu. When grown in competition with B. biternata, the competitive response of the plant height, branch number, total biomass and reproductive biomass of the invasive populations of B. frondosa under high nutrient were significantly lower than that under low nutrient, indicating that this invasive weed was suppressed less under high nutrient compared with that under low nutrient conditions. (2) Under all nutrient conditions, the populations Guangxi and Jiangxi significantly grew higher and had a greater total biomass than the population Hebei. The population Guangxi had the highest number of branches among the four populations when grown at low, medium and high nutrients (12 �0.86, 16.83�.95 and 21.83�.14, respectively). The reproduction ratios of population Hebei grown at low and high nutrients [(47.33 �3.29)% and (25.74 �2.82)%, respectively] were significantly greater than those of population Guangxi when grown under comparable conditions [(30.92 �1.78)% and (19.77 �1.22)%, respectively]. In addition, the competitive response of total biomass were significantly greater for the population Hebei (-0.51�.04) than for the population Guangxi (-0.35�.06) under medium nutrient condition. The competitive response of reproductive biomass of population Hebei (-0.46 �0.03) was also significantly greater than that of population Guangxi (-0.28 �0.07) under medium nutrient. Our results show that nutrient addition can enhance the growth and competitive ability of B. frondosa. Moreover, there are variations in the growth and competitive response among the introduced populations. Therefore, increased nutrient and gene flow may enhance the potential risks of invasion by B. frondosa.
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